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Fact Sheet: August 29, 1997
Chandra Technical Specifications
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Size
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45.3 feet long x 64.0 feet wingspan (fully deployed)
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Weight
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10,160 pounds
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Orbital Data
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Inclination: 28.5 degrees
Perigee altitude: 10,000 kilometers
ApogeApogee altitude: 140,000 kilometers
Ascending node: 200 degrees
Argument of perigee: 270 degrees
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On-orbit life
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> 5 years
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Electrical Power
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Two 3-panel, silicon solar arrays provide 2350 watts of
power (End of Life)
Three 40 ampere-hour nickel hydrogen batteries supply
power in eclipse
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Antennas
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Two low-gain, conical log sprial antennas provide
spherical coverage
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Frequencies
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Transmit 2250 megahertz (MHz)
Receive 2071.8 MHz
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Command Link
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2 kilobits persecond (kbps)
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Data Recording
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Solid-state recorder; 1.8 gigabits (16.8 hours) of
recording capacity
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Downlink Options
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Selectable rates from 32 to 1024 kbps
Downlink data includes pre-recorded engineering and
science instrument data interleaved with real-time data
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Downlink Operations
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Data downloaded to Earth typically every 8 hours
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Contingency Mode
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32kbps
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Safing
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Autonomous operation
No ground intervention required to safe against any
single fault
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High Resolution
Mirror Assembly
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4 sets of nested, grazing incidence
parabaloid/hyperboloid mirror pairs
Mirrors are each 83.3 cm long, constructed of zerodur
material, polished to better than 7 angstroms
root-mean-square (RMS) micro rougness, covered with 600
angstrom iridium coating
Set of mirrors weighs 2104 pounds
Focal Length: 10 meters
Outer diameter: 1.2 meters
Field of view: 1.0 degree diameter
Unobscured clear aperture > 1136 sq. cm
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Altitude Control
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6 reaction wheel control
2 inertial reference units, each with two (2)
two-degrees of freedom dry-tuned gyros updated
autonomously with aspect camera data
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Aspect Camera
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1.40o x 1.40o field of view
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Pointing Stability
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0.25 arcsec (RMS) radius over 95% of all 10 second
periods
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Pointing Accuracy
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30 arcsec 99% of viewing time
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Advanced Charged Coupled Imaging
Spectrometer (ACIS)
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Provides simultaneous time-resolved imaging and
spectroscopy
Uses two CCD arrays, one for imaging, one for
spectroscopy
Imaging resolution is 0.5 arcsec over spectral range
of 0.2 to 10 keV
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High Resolution Camera (HRC)
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Uses large field-of-view imaging micro-channel plates
to detect X-ray photons
Provides highest spatial resolution of any instruments
on Chandra satellite
Angular resolution <0.5 arcsec over the field of
view 31 x 31 arcmin over the spectral range of 0.1 to
10 keV
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High Energy Transmission
Grating
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Designed to be inserted into focused X-ray beam
Contains 336 diffraction gratings
Provides spectral resolution (E/ E) of 60-1000 over
the energy range 0.4 to 10 keV
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Low Energy Transmission
Grating
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Designed to be inserted into focused X-ray beam
Provides spectral resolution (E/E) of 40-2000 over
the energy range 0.09 to 3 keV
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Structural support for Advanced Charged Coupled
Imaging Spectrometer and High Resolution Camera
(HRC)
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Thermal Environment for ACIS and HRC
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Positions either ACIS or HRC into focal plane
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Provides focus adust for ACIS and HRC
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Information provided by NGST, the prime contractor
for Chandra
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